What is the working definition of fire from NFPA 921?

NFPA 921 3.3.53) Fire Cause : The circumstances, conditions, or agencies that bring together a fuel, ignition source, and oxidizer (such as air or oxygen) resulting in a fire or a combustion explosion. (

What is the definition of fire per NFPA 921?

Defining Fire

NFPA 921: “A rapid oxidation process, which is a chemical reaction resulting in the evolution of light and heat in varying intensities.” Webster’s Dictionary: “A fire is an exothermic chemical reaction that emits heat and light”

Which is one of the NFPA 921 classifications of fire cause?

There are four identified fire effect categories—discoloration, deformation, deposition, and mass loss—and each fire effect within them includes a description of related limitations.

What are the four key elements of fire investigation?

In fire investigation work as in real estate, the three most important things are: location, location, and location i.e., fire origin, fire origin, and fire origin. The determination of the fire origin, through a systematic process, is the beginning point for an investigator’s findings and opinions.

IMPORTANT:  Best answer: Can you get in the fire service with asthma?

What are the classifications of fire causes?

There are four classifications of fire cause: accidental, natural, incendiary, and undetermined.

What is the definition of accidental fire?

Accidental fires are those in which the proven cause does not involve any deliberate human act to ignite or spread the fire. While in most instances, this classification is clear, some deliberately set fires can be accidental. For example, an engineer lighting off a boiler is purposely lighting a fire.

What are stages of fire?

By most standards including the International Fire Service Training Association (IFSTA) there are 4 stages of a fire. These stages are incipient, growth, fully developed, and decay.

What are the 5 causes of fire?

5 Leading Causes of House Fires

  • Cooking. Cooking fires are the leading cause of home fires by far, accounting for 48% of all reported residential fires. …
  • Heating. Portable heaters are the second-leading cause of home fires and home fire injuries. …
  • Electrical Fires. …
  • Smoking. …
  • Candles.

What classification should an investigator give to a fire where the ignition was the result of an unintentional human act?

Incendiary fires are caused by a person’s intentional conduct and are predominantly criminal in nature, although a fire caused by a person’s negligent or reckless conduct can sometimes be classified as incendiary.

Which duty would a fire investigator perform at a fire scene investigation?

Fire investigators are responsible for the collection, preservation, and impounding of all arson evidence found at the scene.

What is the importance of NFPA 921 for fire investigations?

NFPA 921 sets the bar for scientific-based investigation and analysis of fire and explosion incidents. Referenced in the field, in training, and in court, it is the foremost guide for rendering accurate opinions as to incident origin, cause, responsibility, and prevention.

IMPORTANT:  Frequent question: What are common fire extinguishing agents?

What are the 2 indications of arson fire?

First, there has been a burning of property. Second, the burning is incendiary in origin, and finally, the burning was started with the intent of destroying the property.

What is fire protection details?

Fire protection refers to measures taken to prevent fire from becoming destructive, reduce the impact of an uncontrolled fire, and save lives and property. Fire protection measures can include: Implementing safety planning practices and drills. … Fire-resistant building construction materials and practices. Safe …

What are the three kinds of origin of fire?

Heat produced by a fire can spread in one of three ways; convection, conduction and radiation.

What is natural fire?

Natural fires are generally started by lightning, with a very small percentage started by spontaneous combustion of dry fuel such as sawdust and leaves. … Human-caused fires constitute the greater percentage of forest fires in our forests, but natural fires constitute the great majority of the total area burned.

What is a big fire called?

A conflagration is a large and destructive fire that threatens human life, animal life, health, and/or property. It may also be described as a blaze or simply a (large) fire. A conflagration can begin accidentally, be naturally caused (wildfire), or intentionally created (arson).